I'm not sure how that would work. How would killing toads help get the secretion? It would be like killing cows for milk. It's just a secretion from their backs that have to be milked.  Maybe the internet wants to spin a narrative that isn't real. 

Unfortunately that may be true. I have only ever worked with people who have respect for the toads. And I know where all my medicine came from. 

fishyness

That's a valid point. I have collected medicine from toads in the past. There is no need to harm them in order to do so. In fact, I felt like I was bonding with the toad. 